Many times I've had to deal with someone who attempted to control me, to tell me how to feel, or blame me for things they did. It's abusive and wrong. When you care about someone and they care about you. It's about supporting their decisions, trusting them, giving them the most honest version of yourself. It's about having a "no-dealbreakers" attitude. Nothing that happens can separate you two because that is your person. Now, with that, I am not saying that you can let them walk all over you. Stay strong and have faith in them when they need it.
Honesty. Honesty is such an important trait in a relationship of any type. Honesty is giving the other person the no filter details on any situation that may occur because you believe they deserve the most accurate and genuine account of any events. Without honesty there can be no trust, without trust you cannot have a healthy well-balanced relationship. It truly is a balance. Each person has to give their weight on either side or else the relationship becomes unbalanced and will topple. Stay honest and you have so much less to worry about in the end.
Trust is something that piggybacks off of honesty, with honesty comes trust and with trust, honesty. The two are sort of a Yin-Yang type of relationship. Honesty can be negative but has a splash of positivity and trust isn't always positive, there can be some negativity just like Yin-Yang. You cannot have one without the other. Once both sides of the relationship commit to these two core principles then the relationship is truly ready to flourish.
Developing a sense of security comes from exploiting the fullness of trust and honesty. When you become secure with someone. You are able to show them parts of you that you never thought you could, you open up and believe in them. It is really an amazing feeling to have that free, open, unchained feeling with someone. Once you feel secure and they do as well it opens up levels of support that have yet to be exposed due to the ability to expose ideas and desires you might have been scared to with someone who brought an unbalanced toxic relationship to the table. Express these interest and when they express theirs, support them, give them motivation, research with them. Be all you can be, do it together. Be honest, be trusting, be supportive.